package com.dhecp.common.utils.file;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;
import com.dhecp.common.config.Global;
import com.dhecp.common.constant.Constants;
import com.dhecp.common.exception.file.FileNameLengthLimitExceededException;
import com.dhecp.common.exception.file.FileSizeLimitExceededException;
import com.dhecp.common.exception.file.InvalidExtensionException;
import com.dhecp.common.utils.DateUtils;
import com.dhecp.common.utils.StringUtils;
import com.dhecp.common.utils.security.Md5Utils;

import javax.imageio.ImageIO;

/**
 * 文件上传工具类
 * 
 * @author ruoyi
 */
public class FileUploadUtils
{
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = Global.getProfile();

    private static int counter = 0;

    public static void setDefaultBaseDir(String defaultBaseDir)
    {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir()
    {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行图片上传
     *
     * @param file 上传的图片
     * @return 文件名称
     * @throws Exception
     */
    public static final String uploadImage(MultipartFile file) throws IOException
    {
        try
        {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.IMAGE_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据图片路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的图片
     * @return 文件名称
     * @throws IOException
     */
    public static final String uploadImage(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException
    {
        try
        {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException
    {
        try
        {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        }
        catch (Exception e)
        {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @param extension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException 比如读写文件出错时
     * @throws InvalidExtensionException 文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException
    {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH)
        {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file)
    {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.dateTime() + "/" + encodingFilename(fileName) + "." + extension; //DateUtils.datePath()
        return fileName;
    }

    public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists())
        {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists())
        {
            desc.createNewFile();
        }
        return desc;
    }

    public static final String getPathFileName(String uploadDir, String fileName) throws IOException
    {
        int dirLastIndex = uploadDir.lastIndexOf("/") + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    private static final String encodingFilename(String fileName)
    {
        fileName = fileName.replace("_", " ");
        fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
        return fileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException
    {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE)
        {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
        {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            }
            else
            {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
        for (String str : allowedExtension)
        {
            if (str.equalsIgnoreCase(extension))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     * 
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file)
    {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension))
        {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }


    /**
     * 文件大小转换成MB,GB形式
     * @param size
     * @return
     */
    public static Map<String, Object> convertFileSize(long size) {
        long kb = 1024;
        long mb = kb * 1024;
        long gb = mb * 1024;

        Map<String, Object> result = new HashMap<>();
        if (size >= gb) {
            result.put("fileSize", String.format("%.2f", (float) size / gb));
            result.put("fileSizeUnit", "GB");
        } else if (size >= mb) {
            float f = (float) size / mb;
            result.put("fileSize", String.format(f > 100 ? "%.2f" : "%.2f", f));
            result.put("fileSizeUnit", "MB");
        } else if (size >= kb) {
            float f = (float) size / kb;
            result.put("fileSize", String.format(f > 100 ? "%.2f" : "%.2f", f));
            result.put("fileSizeUnit", "KB");
        } else {
            result.put("fileSize", String.format("%d B", size));
            result.put("fileSizeUnit", "B");
        }
        return result;
    }

    /**
     * 获取上传的URL地址
     * @return
     */
    public static String  getUploadUrl(){
        return Global.getUploadUrl() + "/api/outer/upload/uploadForERP_1_0";
    }

    /**
     * 获取上传的URL地址
     * @return
     */
    public static String  getFileViewUrl(){
        String uploadUrl = "";
        String uploadType = Global.getUploadType().toLowerCase();
        switch (uploadType){

            case Constants.UPLOAD_LOCALE:  //本地
                uploadUrl = "";
                break;
            case Constants.UPLOAD_REMOTE: //远程
                uploadUrl = Global.getUploadUrl();
                break;
            case Constants.UPLOAD_FASTDFS: //fastdef
                uploadUrl = Global.getUploadUrl()+"/";
                break;
            default:
                uploadUrl = "";
                break;
        }
        return  uploadUrl;
    }

    /**
     * 获取图片像素（传图片上传后路径）
     * @param filePath 图片上传后返回的路径
     * @return
     */
    public static Map<String, Object> getImagePixel(String filePath) {
        BufferedImage bi = null;
        int pixelWidth = 0;
        int pixelHeight = 0;
        Map<String, Object> result = new HashMap<>();
        try {
            String fileAllPath =  Global.getProfile() + filePath.replace(Constants.RESOURCE_PREFIX, "");
            bi = ImageIO.read(new File(fileAllPath));
            pixelWidth = bi.getWidth();  //像素
            pixelHeight = bi.getHeight();//像素
        } catch (Exception e) {
            e.printStackTrace();
        }
        result.put("pixelWidth", pixelWidth);
        result.put("pixelHeight", pixelHeight);
        return  result;
    }
}